[CAUT] Caster noise - solved! 3 noises.

[Don Mannino]

Jim,
 
Thanks for the report.
 
The lock ring problem (ferrel?) is one that comes up - as the piano is
rolled around, over time this ring seems to spin down and cause wobbling
as you found, which makes noise and could cause the caster to come loose
or jam.  A few drops of thin C/A glue on the threads should stop this
from happening, if you can get them in there.
 
The locking handle problem comes from people trying to unscrew the
handle too far.  I've never understood why people do this - the handle
should be snugged down to set the brake, and loosened to release the
break.  But some people turn the screw all the way out, then keep
turning it out, and cause the shaft to be forced up too far.  This can
also mess up the threads badly at the handle, as the locking hex screw
turns on the threads.
 
I can't remember if these are on the Shigeru Kawai EX.  If so, and they
continue to be a problem, let me know.
 
Don Mannino

  _____  

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
Jim Busby
Sent: Tuesday, February 05, 2008 1:41 PM
To: College and University Technicians
Subject: [CAUT] Caster noise - solved! 3 noises.



List,

 

I finally had time to take apart the big casters and find the problem.
Many of you had a part of the puzzle, which actually had 3 noises and
not just one.

 

1.	The ferrel was loose and needed to be tightened. It definitely
clicked there, but after tightening there was still more noise. (see
pic) 
2.	The shaft clicked and grease solved that. (It was a small but
definite noise. Pic) 
3.	The main noise was the actual handle/shaft that needed
tightening. To do this I had to loosening the two small hex nuts on the
handle slightly then turn the handle clockwise (tighten) about 180
degrees. You must hold the back (small nub) of this shaft with pliers or
it will turn. This brought everything tighter and voila! No noise
anywhere. Perfect function. 

 

The pictures show all the important stuff. The last picture shows the
space (lost motion) that needed to be removed. That is where the pen is
pointing. It took a few minutes to discover this procedure, but it
worked well. Too many turns and the wheel won't turn, too loose - noise.

 

I hope this helps someone else. Thanks to all who gave all the clues and
tips.

 

Jim Busby BYU

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